Improvement in saw-mills



A. R. EHLERS. SAWMILL Patented June 2, 1868.

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Letters Patent.No. 78,443, dated June 2, 1868.

IMPROVEMENT IN SAW-MILLS;

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Be it known that I, An'cus'rns It. Err-Incas, of Tanlrersville, in thecounty of Monroe, and State of Pennsylvania, have invented a. newanduseful Improvementin Saw-Mill; andI do hereby declare-that thefollowing is a full, clear, and exact description thereof, which willenable others skilled in the art to make and use the same, referencebeing hadto the accompanying drawings, formingpart of thisspecification.

l ig'ure'l is a vertical section through the framing of a mill,presenting a side view of the saw and its drivingmiachincry. I

Figurefi is a front or edge view of the saw and its driving-machinery.

Similar letters of reference indicate corresponding parts. 4 i

This invention relates to an improvement in the construction ofmachinery for driving a straight saw for sawing lumber, and consists inhanging the saw, in connection with an oscillating-guide and slide, insuch a manner that the saw shall advance-and increase the bite of theteethon thedown stroke, and reccdc and with draw the teeth from the'logon the up stroke, thereby working with much less power-{less wear,greater steadiness,-and more rapidly. p I i A represents the framing forsupporting the saw and machinery of a mill. B isa driving-shaft, havingacrank, a, connected by the pitman b with an oscillating-slide, c, towhich the saw C is attached at the lower end, while its upper end isheld between the edges :of two guide-plates, d d, secured to thecross-beam A 'lhe oscillating-slide 0 works upon oscillating-guide rods0 a, the upper ends of which are fastened to a rock-shaft, g, and thelower ends to the forks h h of a yoke, it, connected with the rock-shaftg, which receives its motion from an eccentric, .lj, on thedriving-shaftJE.

It will be secn that by this arrangement of machinery in connection withthe saw, the lower end will be drawn back from the log to a maximumdegree at the end of its down stroke, when the crank a is on its lowercentre, and thus the saw will allow the log to be moved up at thatmoment, and on its up stroke will rise clear of the kcnf to the highestpoint, from which it will again advance in making the down stroke by aregular lnolcmclllb thus riking the log gently at first, andincreasingthe bite to the end of the stroke, instead of striking the logwith a full bite at the top of the st'roke, in the usual way.

The advantages of this arrangement are important in sawing lumberrapidly and preserving the saw-teeth from wear, as before stated. 1 I

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is I The combination and arrangement of theoseillatin'gslide c, the oscillating-guide rods 0 a, the rock-shafts 11and the eccentric, Ir, on the drivin -shaft I for producing aforward andbackward m'ovement of the saw below its upper end. which moves in thesame vertical plane, as'herein shown and described.

AUGUSTUS ,n. nnnnns.

Witnesses:

Amos :3. Ensure, ween LEARN.

